Linus Torvalds about the SHA1
Security - Fortune

Linus Torvalds about the SHA1
Security

If we want to have any kind of confidence that the hash is
really unbreakable, we should make it not just longer than 160
bits, we should make sure that it's two or more hashes, and that
they are based on totally different principles.

And we should all digitally sign every single object too, and we
should use 4096-bit PGP keys and unguessable passphrases that are
at least 20 words in length. And we should then build a bunker 5
miles underground, encased in lead, so that somebody cannot flip a
few bits with a ray-gun, and make us believe that the sha1's match
when they don't. Oh, and we need to all wear aluminum propeller
beanies to make sure that they don't use that ray-gun to make us do
the modification _ourselves_.